package com.sias.userservice.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sias.common.common.ErrorCode;
import com.sias.common.constant.CommonConstant;
import com.sias.common.exception.BusinessException;
import com.sias.common.utils.SqlUtils;
import com.sias.model.model.dto.user.UserQueryRequest;
import com.sias.model.model.entity.User;
import com.sias.model.model.enums.UserRoleEnum;
import com.sias.model.model.vo.LoginUserVO;
import com.sias.model.model.vo.UserVO;
import com.sias.userservice.mapper.UserMapper;
import com.sias.userservice.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.sias.common.constant.UserConstant.USER_LOGIN_STATE;

/**
 * 用户服务实现
 *
 * @author <a href="https://github.com/sogra">程序员sogra</a>
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

  /**
   * 盐值，混淆密码
   */
  private static final String SALT = "sias";

  @Override
  public long userRegister(String userAccount, String userPassword, String checkPassword) {
    // 1. 校验
    if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword)) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
    }
    if (userAccount.length() < 4) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
    }
    if (userPassword.length() < 8 || checkPassword.length() < 8) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
    }
    // 密码和校验密码相同
    if (!userPassword.equals(checkPassword)) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
    }
    synchronized (userAccount.intern()) {
      // 账户不能重复
      QueryWrapper<User> queryWrapper = new QueryWrapper<>();
      queryWrapper.eq("userAccount", userAccount);
      long count = this.baseMapper.selectCount(queryWrapper);
      if (count > 0) {
        throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
      }
      // 2. 加密
      String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
      // 3. 插入数据
      User user = new User();
      user.setUserAccount(userAccount);
      user.setUserPassword(encryptPassword);
      boolean saveResult = this.save(user);
      if (!saveResult) {
        throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
      }
      return user.getId();
    }
  }

  @Override
  public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
    // 1. 校验
    if (StringUtils.isAnyBlank(userAccount, userPassword)) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
    }
    if (userAccount.length() < 4) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
    }
    if (userPassword.length() < 8) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
    }
    // 2. 加密
    String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    // 查询用户是否存在
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    queryWrapper.eq("userAccount", userAccount);
    queryWrapper.eq("userPassword", encryptPassword);
    User user = this.baseMapper.selectOne(queryWrapper);
    // 用户不存在
    if (user == null) {
      log.info("user login failed, userAccount cannot match userPassword");
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
    }
    // 3. 记录用户的登录态
    request.getSession().setAttribute(USER_LOGIN_STATE, user);
    return this.getLoginUserVO(user);
  }

  /**
   * 获取当前登录用户
   *
   * @param request
   * @return
   */
  @Override
  public User getLoginUser(HttpServletRequest request) {
    // 先判断是否已登录
    Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
    User currentUser = (User) userObj;
    if (currentUser == null || currentUser.getId() == null) {
      throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
    }
    // 从数据库查询（追求性能的话可以注释，直接走缓存）
    long userId = currentUser.getId();
    currentUser = this.getById(userId);
    if (currentUser == null) {
      throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
    }
    return currentUser;
  }

  /**
   * 获取当前登录用户（允许未登录）
   *
   * @param request
   * @return
   */
  @Override
  public User getLoginUserPermitNull(HttpServletRequest request) {
    // 先判断是否已登录
    Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
    User currentUser = (User) userObj;
    if (currentUser == null || currentUser.getId() == null) {
      return null;
    }
    // 从数据库查询（追求性能的话可以注释，直接走缓存）
    long userId = currentUser.getId();
    return this.getById(userId);
  }

  /**
   * 是否为管理员
   *
   * @param request
   * @return
   */
  @Override
  public boolean isAdmin(HttpServletRequest request) {
    // 仅管理员可查询
    Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
    User user = (User) userObj;
    return isAdmin(user);
  }

  @Override
  public boolean isAdmin(User user) {
    return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
  }

  /**
   * 用户注销
   *
   * @param request
   */
  @Override
  public boolean userLogout(HttpServletRequest request) {
    if (request.getSession().getAttribute(USER_LOGIN_STATE) == null) {
      throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
    }
    // 移除登录态
    request.getSession().removeAttribute(USER_LOGIN_STATE);
    return true;
  }

  @Override
  public LoginUserVO getLoginUserVO(User user) {
    if (user == null) {
      return null;
    }
    LoginUserVO loginUserVO = new LoginUserVO();
    BeanUtils.copyProperties(user, loginUserVO);
    return loginUserVO;
  }

  @Override
  public UserVO getUserVO(User user) {
    if (user == null) {
      return null;
    }
    UserVO userVO = new UserVO();
    BeanUtils.copyProperties(user, userVO);
    return userVO;
  }

  @Override
  public List<UserVO> getUserVO(List<User> userList) {
    if (CollectionUtils.isEmpty(userList)) {
      return new ArrayList<>();
    }
    return userList.stream().map(this::getUserVO).collect(Collectors.toList());
  }

  @Override
  public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
    if (userQueryRequest == null) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
    }
    Long id = userQueryRequest.getId();
    String unionId = userQueryRequest.getUnionId();
    String mpOpenId = userQueryRequest.getMpOpenId();
    String userName = userQueryRequest.getUserName();
    String userProfile = userQueryRequest.getUserProfile();
    String userRole = userQueryRequest.getUserRole();
    String sortField = userQueryRequest.getSortField();
    String sortOrder = userQueryRequest.getSortOrder();
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    queryWrapper.eq(id != null, "id", id);
    queryWrapper.eq(StringUtils.isNotBlank(unionId), "unionId", unionId);
    queryWrapper.eq(StringUtils.isNotBlank(mpOpenId), "mpOpenId", mpOpenId);
    queryWrapper.eq(StringUtils.isNotBlank(userRole), "userRole", userRole);
    queryWrapper.like(StringUtils.isNotBlank(userProfile), "userProfile", userProfile);
    queryWrapper.like(StringUtils.isNotBlank(userName), "userName", userName);
    queryWrapper.orderBy(SqlUtils.validSortField(sortField), sortOrder.equals(CommonConstant.SORT_ORDER_ASC),
            sortField);
    return queryWrapper;
  }
}
